中文摘要：

为研究典型藏式古建木构梁柱连接的力学性能,采用非线性有限元方法,建立梁柱连接的实体模型,分析了在楼面竖向荷载作用下,组成梁柱节点的各组件的受力状态,从而获得竖向荷载下节点的传力机理及破坏模式.研究结果表明：在楼面竖向荷载作用下,梁、弓木为受弯构件,垫木为横纹承压构件,斗、柱为顺纹承压构件,暗销主要承受顺纹压力、横向剪切力,组件之间通过接触面的摩擦力、挤压力及暗销剪切力传递荷载,以协同工作.节点的破坏极限采用应力准则确定,当梁受拉侧屈服时认为节点发生破坏.

英文摘要：

To study mechanical performance of ancient Tibetan timber beam-column connection, a re- fined nonlinear FEM model is established. Stress state of components under vertical loads is analyzed. Transfer mechanism and failure mode of the beam-column connection under vertical loads are obtained. The results show that both beam and Gongmu are bending members. At the same time, transverse fibers of Dianmu bear the external load. Longitudinal fibers of column and Dou stand external pres- sures. Dowels mainly bear pressure and horizontal shear force. Components transfer load and work co- operatively through contact friction, contact pressure and dowels. Based on stress criterion, the joint fails when tensile side of beam yields.